/** vim: et:ts=4:sw=4:sts=4
 * @license RequireJS 2.1.18 Copyright (c) 2010-2015, The Dojo Foundation All Rights Reserved.
 * Available via the MIT or new BSD license.
 * see: http://github.com/jrburke/requirejs for details
 */
//Not using strict: uneven strict support in browsers, #392, and causes
//problems with requirejs.exec()/transpiler plugins that may not be strict.
/*jslint regexp: true, nomen: true, sloppy: true */
/*global window, navigator, document, importScripts, setTimeout, opera */

var requirejs, require, define,TS;
window.onload = function(){
    try{
        TS['youerDefine'] = define;
    }catch (e){
        console.debug(String(e));
    }
    define = undefined;
    (function (global) {
        var req, s, head, baseElement, dataMain, src,
            interactiveScript, currentlyAddingScript, mainScript, subPath,
            version = '2.1.18',
            commentRegExp = /(\/\*([\s\S]*?)\*\/|([^:]|^)\/\/(.*)$)/mg,
            cjsRequireRegExp = /[^.]\s*require\s*\(\s*["']([^'"\s]+)["']\s*\)/g,
            jsSuffixRegExp = /\.js$/,
            currDirRegExp = /^\.\//,
            op = Object.prototype,
            ostring = op.toString,
            hasOwn = op.hasOwnProperty,
            ap = Array.prototype,
            apsp = ap.splice,
            isBrowser = !!(typeof window !== 'undefined' && typeof navigator !== 'undefined' && window.document),
            isWebWorker = !isBrowser && typeof importScripts !== 'undefined',
        //PS3 indicates loaded and complete, but need to wait for complete
        //specifically. Sequence is 'loading', 'loaded', execution,
        // then 'complete'. The UA check is unfortunate, but not sure how
        //to feature test w/o causing perf issues.
            readyRegExp = isBrowser && navigator.platform === 'PLAYSTATION 3' ?
                /^complete$/ : /^(complete|loaded)$/,
            defContextName = '_',
        //Oh the tragedy, detecting opera. See the usage of isOpera for reason.
            isOpera = typeof opera !== 'undefined' && opera.toString() === '[object Opera]',
            contexts = {},
            cfg = {},
            globalDefQueue = [],
            useInteractive = false;

        function isFunction(it) {
            return ostring.call(it) === '[object Function]';
        }

        function isArray(it) {
            return ostring.call(it) === '[object Array]';
        }

        /**
         * Helper function for iterating over an array. If the func returns
         * a true value, it will break out of the loop.
         */
        function each(ary, func) {
            if (ary) {
                var i;
                for (i = 0; i < ary.length; i += 1) {
                    if (ary[i] && func(ary[i], i, ary)) {
                        break;
                    }
                }
            }
        }

        /**
         * Helper function for iterating over an array backwards. If the func
         * returns a true value, it will break out of the loop.
         */
        function eachReverse(ary, func) {
            if (ary) {
                var i;
                for (i = ary.length - 1; i > -1; i -= 1) {
                    if (ary[i] && func(ary[i], i, ary)) {
                        break;
                    }
                }
            }
        }

        function hasProp(obj, prop) {
            return hasOwn.call(obj, prop);
        }

        function getOwn(obj, prop) {
            return hasProp(obj, prop) && obj[prop];
        }

        /**
         * Cycles over properties in an object and calls a function for each
         * property value. If the function returns a truthy value, then the
         * iteration is stopped.
         */
        function eachProp(obj, func) {
            var prop;
            for (prop in obj) {
                if (hasProp(obj, prop)) {
                    if (func(obj[prop], prop)) {
                        break;
                    }
                }
            }
        }

        /**
         * Simple function to mix in properties from source into target,
         * but only if target does not already have a property of the same name.
         */
        function mixin(target, source, force, deepStringMixin) {
            if (source) {
                eachProp(source, function (value, prop) {
                    if (force || !hasProp(target, prop)) {
                        if (deepStringMixin && typeof value === 'object' && value &&
                            !isArray(value) && !isFunction(value) &&
                            !(value instanceof RegExp)) {

                            if (!target[prop]) {
                                target[prop] = {};
                            }
                            mixin(target[prop], value, force, deepStringMixin);
                        } else {
                            target[prop] = value;
                        }
                    }
                });
            }
            return target;
        }

        //Similar to Function.prototype.bind, but the 'this' object is specified
        //first, since it is easier to read/figure out what 'this' will be.
        function bind(obj, fn) {
            return function () {
                return fn.apply(obj, arguments);
            };
        }

        function scripts() {
            return document.getElementsByTagName('script');
        }

        function defaultOnError(err) {
            throw err;
        }

        //Allow getting a global that is expressed in
        //dot notation, like 'a.b.c'.
        function getGlobal(value) {
            if (!value) {
                return value;
            }
            var g = global;
            each(value.split('.'), function (part) {
                g = g[part];
            });
            return g;
        }

        /**
         * Constructs an error with a pointer to an URL with more information.
         * @param {String} id the error ID that maps to an ID on a web page.
         * @param {String} message human readable error.
         * @param {Error} [err] the original error, if there is one.
         *
         * @returns {Error}
         */
        function makeError(id, msg, err, requireModules) {
            var e = new Error(msg + '\nhttp://requirejs.org/docs/errors.html#' + id);
            e.requireType = id;
            e.requireModules = requireModules;
            if (err) {
                e.originalError = err;
            }
            return e;
        }

        if (typeof define !== 'undefined') {
            //If a define is already in play via another AMD loader,
            //do not overwrite.
            return;
        }

        if (typeof requirejs !== 'undefined') {
            if (isFunction(requirejs)) {
                //Do not overwrite an existing requirejs instance.
                return;
            }
            cfg = requirejs;
            requirejs = undefined;
        }

        //Allow for a require config object
        if (typeof require !== 'undefined' && !isFunction(require)) {
            //assume it is a config object.
            cfg = require;
            require = undefined;
        }

        function newContext(contextName) {
            var inCheckLoaded, Module, context, handlers,
                checkLoadedTimeoutId,
                config = {
                    //Defaults. Do not set a default for map
                    //config to speed up normalize(), which
                    //will run faster if there is no default.
                    waitSeconds: 7,
                    baseUrl: './',
                    paths: {},
                    bundles: {},
                    pkgs: {},
                    shim: {},
                    config: {}
                },
                registry = {},
            //registry of just enabled modules, to speed
            //cycle breaking code when lots of modules
            //are registered, but not activated.
                enabledRegistry = {},
                undefEvents = {},
                defQueue = [],
                defined = {},
                urlFetched = {},
                bundlesMap = {},
                requireCounter = 1,
                unnormalizedCounter = 1;

            /**
             * Trims the . and .. from an array of path segments.
             * It will keep a leading path segment if a .. will become
             * the first path segment, to help with module name lookups,
             * which act like paths, but can be remapped. But the end result,
             * all paths that use this function should look normalized.
             * NOTE: this method MODIFIES the input array.
             * @param {Array} ary the array of path segments.
             */
            function trimDots(ary) {
                var i, part;
                for (i = 0; i < ary.length; i++) {
                    part = ary[i];
                    if (part === '.') {
                        ary.splice(i, 1);
                        i -= 1;
                    } else if (part === '..') {
                        // If at the start, or previous value is still ..,
                        // keep them so that when converted to a path it may
                        // still work when converted to a path, even though
                        // as an ID it is less than ideal. In larger point
                        // releases, may be better to just kick out an error.
                        if (i === 0 || (i === 1 && ary[2] === '..') || ary[i - 1] === '..') {
                            continue;
                        } else if (i > 0) {
                            ary.splice(i - 1, 2);
                            i -= 2;
                        }
                    }
                }
            }

            /**
             * Given a relative module name, like ./something, normalize it to
             * a real name that can be mapped to a path.
             * @param {String} name the relative name
             * @param {String} baseName a real name that the name arg is relative
             * to.
             * @param {Boolean} applyMap apply the map config to the value. Should
             * only be done if this normalization is for a dependency ID.
             * @returns {String} normalized name
             */
            function normalize(name, baseName, applyMap) {
                var pkgMain, mapValue, nameParts, i, j, nameSegment, lastIndex,
                    foundMap, foundI, foundStarMap, starI, normalizedBaseParts,
                    baseParts = (baseName && baseName.split('/')),
                    map = config.map,
                    starMap = map && map['*'];

                //Adjust any relative paths.
                if (name) {
                    name = name.split('/');
                    lastIndex = name.length - 1;

                    // If wanting node ID compatibility, strip .js from end
                    // of IDs. Have to do this here, and not in nameToUrl
                    // because node allows either .js or non .js to map
                    // to same file.
                    if (config.nodeIdCompat && jsSuffixRegExp.test(name[lastIndex])) {
                        name[lastIndex] = name[lastIndex].replace(jsSuffixRegExp, '');
                    }

                    // Starts with a '.' so need the baseName
                    if (name[0].charAt(0) === '.' && baseParts) {
                        //Convert baseName to array, and lop off the last part,
                        //so that . matches that 'directory' and not name of the baseName's
                        //module. For instance, baseName of 'one/two/three', maps to
                        //'one/two/three.js', but we want the directory, 'one/two' for
                        //this normalization.
                        normalizedBaseParts = baseParts.slice(0, baseParts.length - 1);
                        name = normalizedBaseParts.concat(name);
                    }

                    trimDots(name);
                    name = name.join('/');
                }

                //Apply map config if available.
                if (applyMap && map && (baseParts || starMap)) {
                    nameParts = name.split('/');

                    outerLoop: for (i = nameParts.length; i > 0; i -= 1) {
                        nameSegment = nameParts.slice(0, i).join('/');

                        if (baseParts) {
                            //Find the longest baseName segment match in the config.
                            //So, do joins on the biggest to smallest lengths of baseParts.
                            for (j = baseParts.length; j > 0; j -= 1) {
                                mapValue = getOwn(map, baseParts.slice(0, j).join('/'));

                                //baseName segment has config, find if it has one for
                                //this name.
                                if (mapValue) {
                                    mapValue = getOwn(mapValue, nameSegment);
                                    if (mapValue) {
                                        //Match, update name to the new value.
                                        foundMap = mapValue;
                                        foundI = i;
                                        break outerLoop;
                                    }
                                }
                            }
                        }

                        //Check for a star map match, but just hold on to it,
                        //if there is a shorter segment match later in a matching
                        //config, then favor over this star map.
                        if (!foundStarMap && starMap && getOwn(starMap, nameSegment)) {
                            foundStarMap = getOwn(starMap, nameSegment);
                            starI = i;
                        }
                    }

                    if (!foundMap && foundStarMap) {
                        foundMap = foundStarMap;
                        foundI = starI;
                    }

                    if (foundMap) {
                        nameParts.splice(0, foundI, foundMap);
                        name = nameParts.join('/');
                    }
                }

                // If the name points to a package's name, use
                // the package main instead.
                pkgMain = getOwn(config.pkgs, name);

                return pkgMain ? pkgMain : name;
            }

            function removeScript(name) {
                if (isBrowser) {
                    each(scripts(), function (scriptNode) {
                        if (scriptNode.getAttribute('data-requiremodule') === name &&
                            scriptNode.getAttribute('data-requirecontext') === context.contextName) {
                            scriptNode.parentNode.removeChild(scriptNode);
                            return true;
                        }
                    });
                }
            }

            function hasPathFallback(id) {
                var pathConfig = getOwn(config.paths, id);
                if (pathConfig && isArray(pathConfig) && pathConfig.length > 1) {
                    //Pop off the first array value, since it failed, and
                    //retry
                    pathConfig.shift();
                    context.require.undef(id);

                    //Custom require that does not do map translation, since
                    //ID is "absolute", already mapped/resolved.
                    context.makeRequire(null, {
                        skipMap: true
                    })([id]);

                    return true;
                }
            }

            //Turns a plugin!resource to [plugin, resource]
            //with the plugin being undefined if the name
            //did not have a plugin prefix.
            function splitPrefix(name) {
                var prefix,
                    index = name ? name.indexOf('!') : -1;
                if (index > -1) {
                    prefix = name.substring(0, index);
                    name = name.substring(index + 1, name.length);
                }
                return [prefix, name];
            }

            /**
             * Creates a module mapping that includes plugin prefix, module
             * name, and path. If parentModuleMap is provided it will
             * also normalize the name via require.normalize()
             *
             * @param {String} name the module name
             * @param {String} [parentModuleMap] parent module map
             * for the module name, used to resolve relative names.
             * @param {Boolean} isNormalized: is the ID already normalized.
             * This is true if this call is done for a define() module ID.
             * @param {Boolean} applyMap: apply the map config to the ID.
             * Should only be true if this map is for a dependency.
             *
             * @returns {Object}
             */
            function makeModuleMap(name, parentModuleMap, isNormalized, applyMap) {
                var url, pluginModule, suffix, nameParts,
                    prefix = null,
                    parentName = parentModuleMap ? parentModuleMap.name : null,
                    originalName = name,
                    isDefine = true,
                    normalizedName = '';

                //If no name, then it means it is a require call, generate an
                //internal name.
                if (!name) {
                    isDefine = false;
                    name = '_@r' + (requireCounter += 1);
                }

                nameParts = splitPrefix(name);
                prefix = nameParts[0];
                name = nameParts[1];

                if (prefix) {
                    prefix = normalize(prefix, parentName, applyMap);
                    pluginModule = getOwn(defined, prefix);
                }

                //Account for relative paths if there is a base name.
                if (name) {
                    if (prefix) {
                        if (pluginModule && pluginModule.normalize) {
                            //Plugin is loaded, use its normalize method.
                            normalizedName = pluginModule.normalize(name, function (name) {
                                return normalize(name, parentName, applyMap);
                            });
                        } else {
                            // If nested plugin references, then do not try to
                            // normalize, as it will not normalize correctly. This
                            // places a restriction on resourceIds, and the longer
                            // term solution is not to normalize until plugins are
                            // loaded and all normalizations to allow for async
                            // loading of a loader plugin. But for now, fixes the
                            // common uses. Details in #1131
                            normalizedName = name.indexOf('!') === -1 ?
                                normalize(name, parentName, applyMap) :
                                name;
                        }
                    } else {
                        //A regular module.
                        normalizedName = normalize(name, parentName, applyMap);

                        //Normalized name may be a plugin ID due to map config
                        //application in normalize. The map config values must
                        //already be normalized, so do not need to redo that part.
                        nameParts = splitPrefix(normalizedName);
                        prefix = nameParts[0];
                        normalizedName = nameParts[1];
                        isNormalized = true;

                        url = context.nameToUrl(normalizedName);
                    }
                }

                //If the id is a plugin id that cannot be determined if it needs
                //normalization, stamp it with a unique ID so two matching relative
                //ids that may conflict can be separate.
                suffix = prefix && !pluginModule && !isNormalized ?
                    '_unnormalized' + (unnormalizedCounter += 1) :
                    '';

                return {
                    prefix: prefix,
                    name: normalizedName,
                    parentMap: parentModuleMap,
                    unnormalized: !!suffix,
                    url: url,
                    originalName: originalName,
                    isDefine: isDefine,
                    id: (prefix ?
                        prefix + '!' + normalizedName :
                        normalizedName) + suffix
                };
            }

            function getModule(depMap) {
                var id = depMap.id,
                    mod = getOwn(registry, id);

                if (!mod) {
                    mod = registry[id] = new context.Module(depMap);
                }

                return mod;
            }

            function on(depMap, name, fn) {
                var id = depMap.id,
                    mod = getOwn(registry, id);

                if (hasProp(defined, id) &&
                    (!mod || mod.defineEmitComplete)) {
                    if (name === 'defined') {
                        fn(defined[id]);
                    }
                } else {
                    mod = getModule(depMap);
                    if (mod.error && name === 'error') {
                        fn(mod.error);
                    } else {
                        mod.on(name, fn);
                    }
                }
            }

            function onError(err, errback) {
                var ids = err.requireModules,
                    notified = false;

                if (errback) {
                    errback(err);
                } else {
                    each(ids, function (id) {
                        var mod = getOwn(registry, id);
                        if (mod) {
                            //Set error on module, so it skips timeout checks.
                            mod.error = err;
                            if (mod.events.error) {
                                notified = true;
                                mod.emit('error', err);
                            }
                        }
                    });

                    if (!notified) {
                        req.onError(err);
                    }
                }
            }

            /**
             * Internal method to transfer globalQueue items to this context's
             * defQueue.
             */
            function takeGlobalQueue() {
                //Push all the globalDefQueue items into the context's defQueue
                if (globalDefQueue.length) {
                    //Array splice in the values since the context code has a
                    //local var ref to defQueue, so cannot just reassign the one
                    //on context.
                    apsp.apply(defQueue,
                        [defQueue.length, 0].concat(globalDefQueue));
                    globalDefQueue = [];
                }
            }

            handlers = {
                'require': function (mod) {
                    if (mod.require) {
                        return mod.require;
                    } else {
                        return (mod.require = context.makeRequire(mod.map));
                    }
                },
                'exports': function (mod) {
                    mod.usingExports = true;
                    if (mod.map.isDefine) {
                        if (mod.exports) {
                            return (defined[mod.map.id] = mod.exports);
                        } else {
                            return (mod.exports = defined[mod.map.id] = {});
                        }
                    }
                },
                'module': function (mod) {
                    if (mod.module) {
                        return mod.module;
                    } else {
                        return (mod.module = {
                            id: mod.map.id,
                            uri: mod.map.url,
                            config: function () {
                                return getOwn(config.config, mod.map.id) || {};
                            },
                            exports: mod.exports || (mod.exports = {})
                        });
                    }
                }
            };

            function cleanRegistry(id) {
                //Clean up machinery used for waiting modules.
                delete registry[id];
                delete enabledRegistry[id];
            }

            function breakCycle(mod, traced, processed) {
                var id = mod.map.id;

                if (mod.error) {
                    mod.emit('error', mod.error);
                } else {
                    traced[id] = true;
                    each(mod.depMaps, function (depMap, i) {
                        var depId = depMap.id,
                            dep = getOwn(registry, depId);

                        //Only force things that have not completed
                        //being defined, so still in the registry,
                        //and only if it has not been matched up
                        //in the module already.
                        if (dep && !mod.depMatched[i] && !processed[depId]) {
                            if (getOwn(traced, depId)) {
                                mod.defineDep(i, defined[depId]);
                                mod.check(); //pass false?
                            } else {
                                breakCycle(dep, traced, processed);
                            }
                        }
                    });
                    processed[id] = true;
                }
            }

            function checkLoaded() {
                var err, usingPathFallback,
                    waitInterval = config.waitSeconds * 1000,
                //It is possible to disable the wait interval by using waitSeconds of 0.
                    expired = waitInterval && (context.startTime + waitInterval) < new Date().getTime(),
                    noLoads = [],
                    reqCalls = [],
                    stillLoading = false,
                    needCycleCheck = true;

                //Do not bother if this call was a result of a cycle break.
                if (inCheckLoaded) {
                    return;
                }

                inCheckLoaded = true;

                //Figure out the state of all the modules.
                eachProp(enabledRegistry, function (mod) {
                    var map = mod.map,
                        modId = map.id;

                    //Skip things that are not enabled or in error state.
                    if (!mod.enabled) {
                        return;
                    }

                    if (!map.isDefine) {
                        reqCalls.push(mod);
                    }

                    if (!mod.error) {
                        //If the module should be executed, and it has not
                        //been inited and time is up, remember it.
                        if (!mod.inited && expired) {
                            if (hasPathFallback(modId)) {
                                usingPathFallback = true;
                                stillLoading = true;
                            } else {
                                noLoads.push(modId);
                                removeScript(modId);
                            }
                        } else if (!mod.inited && mod.fetched && map.isDefine) {
                            stillLoading = true;
                            if (!map.prefix) {
                                //No reason to keep looking for unfinished
                                //loading. If the only stillLoading is a
                                //plugin resource though, keep going,
                                //because it may be that a plugin resource
                                //is waiting on a non-plugin cycle.
                                return (needCycleCheck = false);
                            }
                        }
                    }
                });

                if (expired && noLoads.length) {
                    //If wait time expired, throw error of unloaded modules.
                    err = makeError('timeout', 'Load timeout for modules: ' + noLoads, null, noLoads);
                    err.contextName = context.contextName;
                    return onError(err);
                }

                //Not expired, check for a cycle.
                if (needCycleCheck) {
                    each(reqCalls, function (mod) {
                        breakCycle(mod, {}, {});
                    });
                }

                //If still waiting on loads, and the waiting load is something
                //other than a plugin resource, or there are still outstanding
                //scripts, then just try back later.
                if ((!expired || usingPathFallback) && stillLoading) {
                    //Something is still waiting to load. Wait for it, but only
                    //if a timeout is not already in effect.
                    if ((isBrowser || isWebWorker) && !checkLoadedTimeoutId) {
                        checkLoadedTimeoutId = setTimeout(function () {
                            checkLoadedTimeoutId = 0;
                            checkLoaded();
                        }, 50);
                    }
                }

                inCheckLoaded = false;
            }

            Module = function (map) {
                this.events = getOwn(undefEvents, map.id) || {};
                this.map = map;
                this.shim = getOwn(config.shim, map.id);
                this.depExports = [];
                this.depMaps = [];
                this.depMatched = [];
                this.pluginMaps = {};
                this.depCount = 0;

                /* this.exports this.factory
                 this.depMaps = [],
                 this.enabled, this.fetched
                 */
            };

            Module.prototype = {
                init: function (depMaps, factory, errback, options) {
                    options = options || {};

                    //Do not do more inits if already done. Can happen if there
                    //are multiple define calls for the same module. That is not
                    //a normal, common case, but it is also not unexpected.
                    if (this.inited) {
                        return;
                    }

                    this.factory = factory;

                    if (errback) {
                        //Register for errors on this module.
                        this.on('error', errback);
                    } else if (this.events.error) {
                        //If no errback already, but there are error listeners
                        //on this module, set up an errback to pass to the deps.
                        errback = bind(this, function (err) {
                            this.emit('error', err);
                        });
                    }

                    //Do a copy of the dependency array, so that
                    //source inputs are not modified. For example
                    //"shim" deps are passed in here directly, and
                    //doing a direct modification of the depMaps array
                    //would affect that config.
                    this.depMaps = depMaps && depMaps.slice(0);

                    this.errback = errback;

                    //Indicate this module has be initialized
                    this.inited = true;

                    this.ignore = options.ignore;

                    //Could have option to init this module in enabled mode,
                    //or could have been previously marked as enabled. However,
                    //the dependencies are not known until init is called. So
                    //if enabled previously, now trigger dependencies as enabled.
                    if (options.enabled || this.enabled) {
                        //Enable this module and dependencies.
                        //Will call this.check()
                        this.enable();
                    } else {
                        this.check();
                    }
                },

                defineDep: function (i, depExports) {
                    //Because of cycles, defined callback for a given
                    //export can be called more than once.
                    if (!this.depMatched[i]) {
                        this.depMatched[i] = true;
                        this.depCount -= 1;
                        this.depExports[i] = depExports;
                    }
                },

                fetch: function () {
                    if (this.fetched) {
                        return;
                    }
                    this.fetched = true;

                    context.startTime = (new Date()).getTime();

                    var map = this.map;

                    //If the manager is for a plugin managed resource,
                    //ask the plugin to load it now.
                    if (this.shim) {
                        context.makeRequire(this.map, {
                            enableBuildCallback: true
                        })(this.shim.deps || [], bind(this, function () {
                                return map.prefix ? this.callPlugin() : this.load();
                            }));
                    } else {
                        //Regular dependency.
                        return map.prefix ? this.callPlugin() : this.load();
                    }
                },

                load: function () {
                    var url = this.map.url;

                    //Regular dependency.
                    if (!urlFetched[url]) {
                        urlFetched[url] = true;
                        context.load(this.map.id, url);
                    }
                },

                /**
                 * Checks if the module is ready to define itself, and if so,
                 * define it.
                 */
                check: function () {
                    if (!this.enabled || this.enabling) {
                        return;
                    }

                    var err, cjsModule,
                        id = this.map.id,
                        depExports = this.depExports,
                        exports = this.exports,
                        factory = this.factory;

                    if (!this.inited) {
                        this.fetch();
                    } else if (this.error) {
                        this.emit('error', this.error);
                    } else if (!this.defining) {
                        //The factory could trigger another require call
                        //that would result in checking this module to
                        //define itself again. If already in the process
                        //of doing that, skip this work.
                        this.defining = true;

                        if (this.depCount < 1 && !this.defined) {
                            if (isFunction(factory)) {
                                //If there is an error listener, favor passing
                                //to that instead of throwing an error. However,
                                //only do it for define()'d  modules. require
                                //errbacks should not be called for failures in
                                //their callbacks (#699). However if a global
                                //onError is set, use that.
                                if ((this.events.error && this.map.isDefine) ||
                                    req.onError !== defaultOnError) {
                                    try {
                                        exports = context.execCb(id, factory, depExports, exports);
                                    } catch (e) {
                                        err = e;
                                    }
                                } else {
                                    exports = context.execCb(id, factory, depExports, exports);
                                }

                                // Favor return value over exports. If node/cjs in play,
                                // then will not have a return value anyway. Favor
                                // module.exports assignment over exports object.
                                if (this.map.isDefine && exports === undefined) {
                                    cjsModule = this.module;
                                    if (cjsModule) {
                                        exports = cjsModule.exports;
                                    } else if (this.usingExports) {
                                        //exports already set the defined value.
                                        exports = this.exports;
                                    }
                                }

                                if (err) {
                                    err.requireMap = this.map;
                                    err.requireModules = this.map.isDefine ? [this.map.id] : null;
                                    err.requireType = this.map.isDefine ? 'define' : 'require';
                                    return onError((this.error = err));
                                }

                            } else {
                                //Just a literal value
                                exports = factory;
                            }

                            this.exports = exports;

                            if (this.map.isDefine && !this.ignore) {
                                defined[id] = exports;

                                if (req.onResourceLoad) {
                                    req.onResourceLoad(context, this.map, this.depMaps);
                                }
                            }

                            //Clean up
                            cleanRegistry(id);

                            this.defined = true;
                        }

                        //Finished the define stage. Allow calling check again
                        //to allow define notifications below in the case of a
                        //cycle.
                        this.defining = false;

                        if (this.defined && !this.defineEmitted) {
                            this.defineEmitted = true;
                            this.emit('defined', this.exports);
                            this.defineEmitComplete = true;
                        }

                    }
                },

                callPlugin: function () {
                    var map = this.map,
                        id = map.id,
                    //Map already normalized the prefix.
                        pluginMap = makeModuleMap(map.prefix);

                    //Mark this as a dependency for this plugin, so it
                    //can be traced for cycles.
                    this.depMaps.push(pluginMap);

                    on(pluginMap, 'defined', bind(this, function (plugin) {
                        var load, normalizedMap, normalizedMod,
                            bundleId = getOwn(bundlesMap, this.map.id),
                            name = this.map.name,
                            parentName = this.map.parentMap ? this.map.parentMap.name : null,
                            localRequire = context.makeRequire(map.parentMap, {
                                enableBuildCallback: true
                            });

                        //If current map is not normalized, wait for that
                        //normalized name to load instead of continuing.
                        if (this.map.unnormalized) {
                            //Normalize the ID if the plugin allows it.
                            if (plugin.normalize) {
                                name = plugin.normalize(name, function (name) {
                                    return normalize(name, parentName, true);
                                }) || '';
                            }

                            //prefix and name should already be normalized, no need
                            //for applying map config again either.
                            normalizedMap = makeModuleMap(map.prefix + '!' + name,
                                this.map.parentMap);
                            on(normalizedMap,
                                'defined', bind(this, function (value) {
                                    this.init([], function () { return value; }, null, {
                                        enabled: true,
                                        ignore: true
                                    });
                                }));

                            normalizedMod = getOwn(registry, normalizedMap.id);
                            if (normalizedMod) {
                                //Mark this as a dependency for this plugin, so it
                                //can be traced for cycles.
                                this.depMaps.push(normalizedMap);

                                if (this.events.error) {
                                    normalizedMod.on('error', bind(this, function (err) {
                                        this.emit('error', err);
                                    }));
                                }
                                normalizedMod.enable();
                            }

                            return;
                        }

                        //If a paths config, then just load that file instead to
                        //resolve the plugin, as it is built into that paths layer.
                        if (bundleId) {
                            this.map.url = context.nameToUrl(bundleId);
                            this.load();
                            return;
                        }

                        load = bind(this, function (value) {
                            this.init([], function () { return value; }, null, {
                                enabled: true
                            });
                        });

                        load.error = bind(this, function (err) {
                            this.inited = true;
                            this.error = err;
                            err.requireModules = [id];

                            //Remove temp unnormalized modules for this module,
                            //since they will never be resolved otherwise now.
                            eachProp(registry, function (mod) {
                                if (mod.map.id.indexOf(id + '_unnormalized') === 0) {
                                    cleanRegistry(mod.map.id);
                                }
                            });

                            onError(err);
                        });

                        //Allow plugins to load other code without having to know the
                        //context or how to 'complete' the load.
                        load.fromText = bind(this, function (text, textAlt) {
                            /*jslint evil: true */
                            var moduleName = map.name,
                                moduleMap = makeModuleMap(moduleName),
                                hasInteractive = useInteractive;

                            //As of 2.1.0, support just passing the text, to reinforce
                            //fromText only being called once per resource. Still
                            //support old style of passing moduleName but discard
                            //that moduleName in favor of the internal ref.
                            if (textAlt) {
                                text = textAlt;
                            }

                            //Turn off interactive script matching for IE for any define
                            //calls in the text, then turn it back on at the end.
                            if (hasInteractive) {
                                useInteractive = false;
                            }

                            //Prime the system by creating a module instance for
                            //it.
                            getModule(moduleMap);

                            //Transfer any config to this other module.
                            if (hasProp(config.config, id)) {
                                config.config[moduleName] = config.config[id];
                            }

                            try {
                                req.exec(text);
                            } catch (e) {
                                return onError(makeError('fromtexteval',
                                    'fromText eval for ' + id +
                                        ' failed: ' + e,
                                    e,
                                    [id]));
                            }

                            if (hasInteractive) {
                                useInteractive = true;
                            }

                            //Mark this as a dependency for the plugin
                            //resource
                            this.depMaps.push(moduleMap);

                            //Support anonymous modules.
                            context.completeLoad(moduleName);

                            //Bind the value of that module to the value for this
                            //resource ID.
                            localRequire([moduleName], load);
                        });

                        //Use parentName here since the plugin's name is not reliable,
                        //could be some weird string with no path that actually wants to
                        //reference the parentName's path.
                        plugin.load(map.name, localRequire, load, config);
                    }));

                    context.enable(pluginMap, this);
                    this.pluginMaps[pluginMap.id] = pluginMap;
                },

                enable: function () {
                    enabledRegistry[this.map.id] = this;
                    this.enabled = true;

                    //Set flag mentioning that the module is enabling,
                    //so that immediate calls to the defined callbacks
                    //for dependencies do not trigger inadvertent load
                    //with the depCount still being zero.
                    this.enabling = true;

                    //Enable each dependency
                    each(this.depMaps, bind(this, function (depMap, i) {
                        var id, mod, handler;

                        if (typeof depMap === 'string') {
                            //Dependency needs to be converted to a depMap
                            //and wired up to this module.
                            depMap = makeModuleMap(depMap,
                                (this.map.isDefine ? this.map : this.map.parentMap),
                                false,
                                !this.skipMap);
                            this.depMaps[i] = depMap;

                            handler = getOwn(handlers, depMap.id);

                            if (handler) {
                                this.depExports[i] = handler(this);
                                return;
                            }

                            this.depCount += 1;

                            on(depMap, 'defined', bind(this, function (depExports) {
                                if (this.undefed) {
                                    return;
                                }
                                this.defineDep(i, depExports);
                                this.check();
                            }));

                            if (this.errback) {
                                on(depMap, 'error', bind(this, this.errback));
                            } else if (this.events.error) {
                                // No direct errback on this module, but something
                                // else is listening for errors, so be sure to
                                // propagate the error correctly.
                                on(depMap, 'error', bind(this, function(err) {
                                    this.emit('error', err);
                                }));
                            }
                        }

                        id = depMap.id;
                        mod = registry[id];

                        //Skip special modules like 'require', 'exports', 'module'
                        //Also, don't call enable if it is already enabled,
                        //important in circular dependency cases.
                        if (!hasProp(handlers, id) && mod && !mod.enabled) {
                            context.enable(depMap, this);
                        }
                    }));

                    //Enable each plugin that is used in
                    //a dependency
                    eachProp(this.pluginMaps, bind(this, function (pluginMap) {
                        var mod = getOwn(registry, pluginMap.id);
                        if (mod && !mod.enabled) {
                            context.enable(pluginMap, this);
                        }
                    }));

                    this.enabling = false;

                    this.check();
                },

                on: function (name, cb) {
                    var cbs = this.events[name];
                    if (!cbs) {
                        cbs = this.events[name] = [];
                    }
                    cbs.push(cb);
                },

                emit: function (name, evt) {
                    each(this.events[name], function (cb) {
                        cb(evt);
                    });
                    if (name === 'error') {
                        //Now that the error handler was triggered, remove
                        //the listeners, since this broken Module instance
                        //can stay around for a while in the registry.
                        delete this.events[name];
                    }
                }
            };

            function callGetModule(args) {
                //Skip modules already defined.
                if (!hasProp(defined, args[0])) {
                    getModule(makeModuleMap(args[0], null, true)).init(args[1], args[2]);
                }
            }

            function removeListener(node, func, name, ieName) {
                //Favor detachEvent because of IE9
                //issue, see attachEvent/addEventListener comment elsewhere
                //in this file.
                if (node.detachEvent && !isOpera) {
                    //Probably IE. If not it will throw an error, which will be
                    //useful to know.
                    if (ieName) {
                        node.detachEvent(ieName, func);
                    }
                } else {
                    node.removeEventListener(name, func, false);
                }
            }

            /**
             * Given an event from a script node, get the requirejs info from it,
             * and then removes the event listeners on the node.
             * @param {Event} evt
             * @returns {Object}
             */
            function getScriptData(evt) {
                //Using currentTarget instead of target for Firefox 2.0's sake. Not
                //all old browsers will be supported, but this one was easy enough
                //to support and still makes sense.
                var node = evt.currentTarget || evt.srcElement;

                //Remove the listeners once here.
                removeListener(node, context.onScriptLoad, 'load', 'onreadystatechange');
                removeListener(node, context.onScriptError, 'error');

                return {
                    node: node,
                    id: node && node.getAttribute('data-requiremodule')
                };
            }

            function intakeDefines() {
                var args;

                //Any defined modules in the global queue, intake them now.
                takeGlobalQueue();

                //Make sure any remaining defQueue items get properly processed.
                while (defQueue.length) {
                    args = defQueue.shift();
                    if (args[0] === null) {
                        return onError(makeError('mismatch', 'Mismatched anonymous define() module: ' +
                            args[args.length - 1]));
                    } else {
                        //args are id, deps, factory. Should be normalized by the
                        //define() function.
                        callGetModule(args);
                    }
                }
            }

            context = {
                config: config,
                contextName: contextName,
                registry: registry,
                defined: defined,
                urlFetched: urlFetched,
                defQueue: defQueue,
                Module: Module,
                makeModuleMap: makeModuleMap,
                nextTick: req.nextTick,
                onError: onError,

                /**
                 * Set a configuration for the context.
                 * @param {Object} cfg config object to integrate.
                 */
                configure: function (cfg) {
                    //Make sure the baseUrl ends in a slash.
                    if (cfg.baseUrl) {
                        if (cfg.baseUrl.charAt(cfg.baseUrl.length - 1) !== '/') {
                            cfg.baseUrl += '/';
                        }
                    }

                    //Save off the paths since they require special processing,
                    //they are additive.
                    var shim = config.shim,
                        objs = {
                            paths: true,
                            bundles: true,
                            config: true,
                            map: true
                        };

                    eachProp(cfg, function (value, prop) {
                        if (objs[prop]) {
                            if (!config[prop]) {
                                config[prop] = {};
                            }
                            mixin(config[prop], value, true, true);
                        } else {
                            config[prop] = value;
                        }
                    });

                    //Reverse map the bundles
                    if (cfg.bundles) {
                        eachProp(cfg.bundles, function (value, prop) {
                            each(value, function (v) {
                                if (v !== prop) {
                                    bundlesMap[v] = prop;
                                }
                            });
                        });
                    }

                    //Merge shim
                    if (cfg.shim) {
                        eachProp(cfg.shim, function (value, id) {
                            //Normalize the structure
                            if (isArray(value)) {
                                value = {
                                    deps: value
                                };
                            }
                            if ((value.exports || value.init) && !value.exportsFn) {
                                value.exportsFn = context.makeShimExports(value);
                            }
                            shim[id] = value;
                        });
                        config.shim = shim;
                    }

                    //Adjust packages if necessary.
                    if (cfg.packages) {
                        each(cfg.packages, function (pkgObj) {
                            var location, name;

                            pkgObj = typeof pkgObj === 'string' ? {name: pkgObj} : pkgObj;

                            name = pkgObj.name;
                            location = pkgObj.location;
                            if (location) {
                                config.paths[name] = pkgObj.location;
                            }

                            //Save pointer to main module ID for pkg name.
                            //Remove leading dot in main, so main paths are normalized,
                            //and remove any trailing .js, since different package
                            //envs have different conventions: some use a module name,
                            //some use a file name.
                            config.pkgs[name] = pkgObj.name + '/' + (pkgObj.main || 'main')
                                .replace(currDirRegExp, '')
                                .replace(jsSuffixRegExp, '');
                        });
                    }

                    //If there are any "waiting to execute" modules in the registry,
                    //update the maps for them, since their info, like URLs to load,
                    //may have changed.
                    eachProp(registry, function (mod, id) {
                        //If module already has init called, since it is too
                        //late to modify them, and ignore unnormalized ones
                        //since they are transient.
                        if (!mod.inited && !mod.map.unnormalized) {
                            mod.map = makeModuleMap(id, null, true);
                        }
                    });

                    //If a deps array or a config callback is specified, then call
                    //require with those args. This is useful when require is defined as a
                    //config object before require.js is loaded.
                    if (cfg.deps || cfg.callback) {
                        context.require(cfg.deps || [], cfg.callback);
                    }
                },

                makeShimExports: function (value) {
                    function fn() {
                        var ret;
                        if (value.init) {
                            ret = value.init.apply(global, arguments);
                        }
                        return ret || (value.exports && getGlobal(value.exports));
                    }
                    return fn;
                },

                makeRequire: function (relMap, options) {
                    options = options || {};

                    function localRequire(deps, callback, errback) {
                        var id, map, requireMod;

                        if (options.enableBuildCallback && callback && isFunction(callback)) {
                            callback.__requireJsBuild = true;
                        }

                        if (typeof deps === 'string') {
                            if (isFunction(callback)) {
                                //Invalid call
                                return onError(makeError('requireargs', 'Invalid require call'), errback);
                            }

                            //If require|exports|module are requested, get the
                            //value for them from the special handlers. Caveat:
                            //this only works while module is being defined.
                            if (relMap && hasProp(handlers, deps)) {
                                return handlers[deps](registry[relMap.id]);
                            }

                            //Synchronous access to one module. If require.get is
                            //available (as in the Node adapter), prefer that.
                            if (req.get) {
                                return req.get(context, deps, relMap, localRequire);
                            }

                            //Normalize module name, if it contains . or ..
                            map = makeModuleMap(deps, relMap, false, true);
                            id = map.id;

                            if (!hasProp(defined, id)) {
                                return onError(makeError('notloaded', 'Module name "' +
                                    id +
                                    '" has not been loaded yet for context: ' +
                                    contextName +
                                    (relMap ? '' : '. Use require([])')));
                            }
                            return defined[id];
                        }

                        //Grab defines waiting in the global queue.
                        intakeDefines();

                        //Mark all the dependencies as needing to be loaded.
                        context.nextTick(function () {
                            //Some defines could have been added since the
                            //require call, collect them.
                            intakeDefines();

                            requireMod = getModule(makeModuleMap(null, relMap));

                            //Store if map config should be applied to this require
                            //call for dependencies.
                            requireMod.skipMap = options.skipMap;

                            requireMod.init(deps, callback, errback, {
                                enabled: true
                            });

                            checkLoaded();
                        });

                        return localRequire;
                    }

                    mixin(localRequire, {
                        isBrowser: isBrowser,

                        /**
                         * Converts a module name + .extension into an URL path.
                         * *Requires* the use of a module name. It does not support using
                         * plain URLs like nameToUrl.
                         */
                        toUrl: function (moduleNamePlusExt) {
                            var ext,
                                index = moduleNamePlusExt.lastIndexOf('.'),
                                segment = moduleNamePlusExt.split('/')[0],
                                isRelative = segment === '.' || segment === '..';

                            //Have a file extension alias, and it is not the
                            //dots from a relative path.
                            if (index !== -1 && (!isRelative || index > 1)) {
                                ext = moduleNamePlusExt.substring(index, moduleNamePlusExt.length);
                                moduleNamePlusExt = moduleNamePlusExt.substring(0, index);
                            }

                            return context.nameToUrl(normalize(moduleNamePlusExt,
                                relMap && relMap.id, true), ext,  true);
                        },

                        defined: function (id) {
                            return hasProp(defined, makeModuleMap(id, relMap, false, true).id);
                        },

                        specified: function (id) {
                            id = makeModuleMap(id, relMap, false, true).id;
                            return hasProp(defined, id) || hasProp(registry, id);
                        }
                    });

                    //Only allow undef on top level require calls
                    if (!relMap) {
                        localRequire.undef = function (id) {
                            //Bind any waiting define() calls to this context,
                            //fix for #408
                            takeGlobalQueue();

                            var map = makeModuleMap(id, relMap, true),
                                mod = getOwn(registry, id);

                            mod.undefed = true;
                            removeScript(id);

                            delete defined[id];
                            delete urlFetched[map.url];
                            delete undefEvents[id];

                            //Clean queued defines too. Go backwards
                            //in array so that the splices do not
                            //mess up the iteration.
                            eachReverse(defQueue, function(args, i) {
                                if (args[0] === id) {
                                    defQueue.splice(i, 1);
                                }
                            });

                            if (mod) {
                                //Hold on to listeners in case the
                                //module will be attempted to be reloaded
                                //using a different config.
                                if (mod.events.defined) {
                                    undefEvents[id] = mod.events;
                                }

                                cleanRegistry(id);
                            }
                        };
                    }

                    return localRequire;
                },

                /**
                 * Called to enable a module if it is still in the registry
                 * awaiting enablement. A second arg, parent, the parent module,
                 * is passed in for context, when this method is overridden by
                 * the optimizer. Not shown here to keep code compact.
                 */
                enable: function (depMap) {
                    var mod = getOwn(registry, depMap.id);
                    if (mod) {
                        getModule(depMap).enable();
                    }
                },

                /**
                 * Internal method used by environment adapters to complete a load event.
                 * A load event could be a script load or just a load pass from a synchronous
                 * load call.
                 * @param {String} moduleName the name of the module to potentially complete.
                 */
                completeLoad: function (moduleName) {
                    var found, args, mod,
                        shim = getOwn(config.shim, moduleName) || {},
                        shExports = shim.exports;

                    takeGlobalQueue();

                    while (defQueue.length) {
                        args = defQueue.shift();
                        if (args[0] === null) {
                            args[0] = moduleName;
                            //If already found an anonymous module and bound it
                            //to this name, then this is some other anon module
                            //waiting for its completeLoad to fire.
                            if (found) {
                                break;
                            }
                            found = true;
                        } else if (args[0] === moduleName) {
                            //Found matching define call for this script!
                            found = true;
                        }

                        callGetModule(args);
                    }

                    //Do this after the cycle of callGetModule in case the result
                    //of those calls/init calls changes the registry.
                    mod = getOwn(registry, moduleName);

                    if (!found && !hasProp(defined, moduleName) && mod && !mod.inited) {
                        if (config.enforceDefine && (!shExports || !getGlobal(shExports))) {
                            if (hasPathFallback(moduleName)) {
                                return;
                            } else {
                                return onError(makeError('nodefine',
                                    'No define call for ' + moduleName,
                                    null,
                                    [moduleName]));
                            }
                        } else {
                            //A script that does not call define(), so just simulate
                            //the call for it.
                            callGetModule([moduleName, (shim.deps || []), shim.exportsFn]);
                        }
                    }

                    checkLoaded();
                },

                /**
                 * Converts a module name to a file path. Supports cases where
                 * moduleName may actually be just an URL.
                 * Note that it **does not** call normalize on the moduleName,
                 * it is assumed to have already been normalized. This is an
                 * internal API, not a public one. Use toUrl for the public API.
                 */
                nameToUrl: function (moduleName, ext, skipExt) {
                    var paths, syms, i, parentModule, url,
                        parentPath, bundleId,
                        pkgMain = getOwn(config.pkgs, moduleName);

                    if (pkgMain) {
                        moduleName = pkgMain;
                    }

                    bundleId = getOwn(bundlesMap, moduleName);

                    if (bundleId) {
                        return context.nameToUrl(bundleId, ext, skipExt);
                    }

                    //If a colon is in the URL, it indicates a protocol is used and it is just
                    //an URL to a file, or if it starts with a slash, contains a query arg (i.e. ?)
                    //or ends with .js, then assume the user meant to use an url and not a module id.
                    //The slash is important for protocol-less URLs as well as full paths.
                    if (req.jsExtRegExp.test(moduleName)) {
                        //Just a plain path, not module name lookup, so just return it.
                        //Add extension if it is included. This is a bit wonky, only non-.js things pass
                        //an extension, this method probably needs to be reworked.
                        url = moduleName + (ext || '');
                    } else {
                        //A module that needs to be converted to a path.
                        paths = config.paths;

                        syms = moduleName.split('/');
                        //For each module name segment, see if there is a path
                        //registered for it. Start with most specific name
                        //and work up from it.
                        for (i = syms.length; i > 0; i -= 1) {
                            parentModule = syms.slice(0, i).join('/');

                            parentPath = getOwn(paths, parentModule);
                            if (parentPath) {
                                //If an array, it means there are a few choices,
                                //Choose the one that is desired
                                if (isArray(parentPath)) {
                                    parentPath = parentPath[0];
                                }
                                syms.splice(0, i, parentPath);
                                break;
                            }
                        }

                        //Join the path parts together, then figure out if baseUrl is needed.
                        url = syms.join('/');
                        url += (ext || (/^data\:|\?/.test(url) || skipExt ? '' : '.js'));
                        url = (url.charAt(0) === '/' || url.match(/^[\w\+\.\-]+:/) ? '' : config.baseUrl) + url;
                    }

                    return config.urlArgs ? url +
                        ((url.indexOf('?') === -1 ? '?' : '&') +
                            config.urlArgs) : url;
                },

                //Delegates to req.load. Broken out as a separate function to
                //allow overriding in the optimizer.
                load: function (id, url) {
                    req.load(context, id, url);
                },

                /**
                 * Executes a module callback function. Broken out as a separate function
                 * solely to allow the build system to sequence the files in the built
                 * layer in the right sequence.
                 *
                 * @private
                 */
                execCb: function (name, callback, args, exports) {
                    return callback.apply(exports, args);
                },

                /**
                 * callback for script loads, used to check status of loading.
                 *
                 * @param {Event} evt the event from the browser for the script
                 * that was loaded.
                 */
                onScriptLoad: function (evt) {
                    //Using currentTarget instead of target for Firefox 2.0's sake. Not
                    //all old browsers will be supported, but this one was easy enough
                    //to support and still makes sense.
                    if (evt.type === 'load' ||
                        (readyRegExp.test((evt.currentTarget || evt.srcElement).readyState))) {
                        //Reset interactive script so a script node is not held onto for
                        //to long.
                        interactiveScript = null;

                        //Pull out the name of the module and the context.
                        var data = getScriptData(evt);
                        context.completeLoad(data.id);
                    }
                },

                /**
                 * Callback for script errors.
                 */
                onScriptError: function (evt) {
                    var data = getScriptData(evt);
                    if (!hasPathFallback(data.id)) {
                        return onError(makeError('scripterror', 'Script error for: ' + data.id, evt, [data.id]));
                    }
                }
            };

            context.require = context.makeRequire();
            return context;
        }

        /**
         * Main entry point.
         *
         * If the only argument to require is a string, then the module that
         * is represented by that string is fetched for the appropriate context.
         *
         * If the first argument is an array, then it will be treated as an array
         * of dependency string names to fetch. An optional function callback can
         * be specified to execute when all of those dependencies are available.
         *
         * Make a local req variable to help Caja compliance (it assumes things
         * on a require that are not standardized), and to give a short
         * name for minification/local scope use.
         */
        req = requirejs = function (deps, callback, errback, optional) {

            //Find the right context, use default
            var context, config,
                contextName = defContextName;

            // Determine if have config object in the call.
            if (!isArray(deps) && typeof deps !== 'string') {
                // deps is a config object
                config = deps;
                if (isArray(callback)) {
                    // Adjust args if there are dependencies
                    deps = callback;
                    callback = errback;
                    errback = optional;
                } else {
                    deps = [];
                }
            }

            if (config && config.context) {
                contextName = config.context;
            }

            context = getOwn(contexts, contextName);
            if (!context) {
                context = contexts[contextName] = req.s.newContext(contextName);
            }

            if (config) {
                context.configure(config);
            }

            return context.require(deps, callback, errback);
        };

        /**
         * Support require.config() to make it easier to cooperate with other
         * AMD loaders on globally agreed names.
         */
        req.config = function (config) {
            return req(config);
        };

        /**
         * Execute something after the current tick
         * of the event loop. Override for other envs
         * that have a better solution than setTimeout.
         * @param  {Function} fn function to execute later.
         */
        req.nextTick = typeof setTimeout !== 'undefined' ? function (fn) {
            setTimeout(fn, 4);
        } : function (fn) { fn(); };

        /**
         * Export require as a global, but only if it does not already exist.
         */
        if (!require) {
            require = req;
        }

        req.version = version;

        //Used to filter out dependencies that are already paths.
        req.jsExtRegExp = /^\/|:|\?|\.js$/;
        req.isBrowser = isBrowser;
        s = req.s = {
            contexts: contexts,
            newContext: newContext
        };

        //Create default context.
        req({});

        //Exports some context-sensitive methods on global require.
        each([
            'toUrl',
            'undef',
            'defined',
            'specified'
        ], function (prop) {
            //Reference from contexts instead of early binding to default context,
            //so that during builds, the latest instance of the default context
            //with its config gets used.
            req[prop] = function () {
                var ctx = contexts[defContextName];
                return ctx.require[prop].apply(ctx, arguments);
            };
        });

        if (isBrowser) {
            head = s.head = document.getElementsByTagName('head')[0];
            //If BASE tag is in play, using appendChild is a problem for IE6.
            //When that browser dies, this can be removed. Details in this jQuery bug:
            //http://dev.jquery.com/ticket/2709
            baseElement = document.getElementsByTagName('base')[0];
            if (baseElement) {
                head = s.head = baseElement.parentNode;
            }
        }

        /**
         * Any errors that require explicitly generates will be passed to this
         * function. Intercept/override it if you want custom error handling.
         * @param {Error} err the error object.
         */
        req.onError = defaultOnError;

        /**
         * Creates the node for the load command. Only used in browser envs.
         */
        req.createNode = function (config, moduleName, url) {
            var node = config.xhtml ?
                document.createElementNS('http://www.w3.org/1999/xhtml', 'html:script') :
                document.createElement('script');
            node.type = config.scriptType || 'text/javascript';
            node.charset = 'utf-8';
            node.async = true;
            return node;
        };

        /**
         * Does the request to load a module for the browser case.
         * Make this a separate function to allow other environments
         * to override it.
         *
         * @param {Object} context the require context to find state.
         * @param {String} moduleName the name of the module.
         * @param {Object} url the URL to the module.
         */
        req.load = function (context, moduleName, url) {
            var config = (context && context.config) || {},
                node;
            if (isBrowser) {
                //In the browser so use a script tag
                node = req.createNode(config, moduleName, url);

                node.setAttribute('data-requirecontext', context.contextName);
                node.setAttribute('data-requiremodule', moduleName);

                //Set up load listener. Test attachEvent first because IE9 has
                //a subtle issue in its addEventListener and script onload firings
                //that do not match the behavior of all other browsers with
                //addEventListener support, which fire the onload event for a
                //script right after the script execution. See:
                //https://connect.microsoft.com/IE/feedback/details/648057/script-onload-event-is-not-fired-immediately-after-script-execution
                //UNFORTUNATELY Opera implements attachEvent but does not follow the script
                //script execution mode.
                if (node.attachEvent &&
                    //Check if node.attachEvent is artificially added by custom script or
                    //natively supported by browser
                    //read https://github.com/jrburke/requirejs/issues/187
                    //if we can NOT find [native code] then it must NOT natively supported.
                    //in IE8, node.attachEvent does not have toString()
                    //Note the test for "[native code" with no closing brace, see:
                    //https://github.com/jrburke/requirejs/issues/273
                    !(node.attachEvent.toString && node.attachEvent.toString().indexOf('[native code') < 0) &&
                    !isOpera) {
                    //Probably IE. IE (at least 6-8) do not fire
                    //script onload right after executing the script, so
                    //we cannot tie the anonymous define call to a name.
                    //However, IE reports the script as being in 'interactive'
                    //readyState at the time of the define call.
                    useInteractive = true;

                    node.attachEvent('onreadystatechange', context.onScriptLoad);
                    //It would be great to add an error handler here to catch
                    //404s in IE9+. However, onreadystatechange will fire before
                    //the error handler, so that does not help. If addEventListener
                    //is used, then IE will fire error before load, but we cannot
                    //use that pathway given the connect.microsoft.com issue
                    //mentioned above about not doing the 'script execute,
                    //then fire the script load event listener before execute
                    //next script' that other browsers do.
                    //Best hope: IE10 fixes the issues,
                    //and then destroys all installs of IE 6-9.
                    //node.attachEvent('onerror', context.onScriptError);
                } else {
                    node.addEventListener('load', context.onScriptLoad, false);
                    node.addEventListener('error', context.onScriptError, false);
                }
                node.src = url;

                //For some cache cases in IE 6-8, the script executes before the end
                //of the appendChild execution, so to tie an anonymous define
                //call to the module name (which is stored on the node), hold on
                //to a reference to this node, but clear after the DOM insertion.
                currentlyAddingScript = node;
                if (baseElement) {
                    head.insertBefore(node, baseElement);
                } else {
                    head.appendChild(node);
                }
                currentlyAddingScript = null;

                return node;
            } else if (isWebWorker) {
                try {
                    //In a web worker, use importScripts. This is not a very
                    //efficient use of importScripts, importScripts will block until
                    //its script is downloaded and evaluated. However, if web workers
                    //are in play, the expectation that a build has been done so that
                    //only one script needs to be loaded anyway. This may need to be
                    //reevaluated if other use cases become common.
                    importScripts(url);

                    //Account for anonymous modules
                    context.completeLoad(moduleName);
                } catch (e) {
                    context.onError(makeError('importscripts',
                        'importScripts failed for ' +
                            moduleName + ' at ' + url,
                        e,
                        [moduleName]));
                }
            }
        };

        function getInteractiveScript() {
            if (interactiveScript && interactiveScript.readyState === 'interactive') {
                return interactiveScript;
            }

            eachReverse(scripts(), function (script) {
                if (script.readyState === 'interactive') {
                    return (interactiveScript = script);
                }
            });
            return interactiveScript;
        }

        //Look for a data-main script attribute, which could also adjust the baseUrl.
        if (isBrowser && !cfg.skipDataMain) {
            //Figure out baseUrl. Get it from the script tag with require.js in it.
            eachReverse(scripts(), function (script) {
                //Set the 'head' where we can append children by
                //using the script's parent.
                if (!head) {
                    head = script.parentNode;
                }

                //Look for a data-main attribute to set main script for the page
                //to load. If it is there, the path to data main becomes the
                //baseUrl, if it is not already set.
                dataMain = script.getAttribute('data-main');
                if (dataMain) {
                    //Preserve dataMain in case it is a path (i.e. contains '?')
                    mainScript = dataMain;

                    //Set final baseUrl if there is not already an explicit one.
                    if (!cfg.baseUrl) {
                        //Pull off the directory of data-main for use as the
                        //baseUrl.
                        src = mainScript.split('/');
                        mainScript = src.pop();
                        subPath = src.length ? src.join('/')  + '/' : './';

                        cfg.baseUrl = subPath;
                    }

                    //Strip off any trailing .js since mainScript is now
                    //like a module name.
                    mainScript = mainScript.replace(jsSuffixRegExp, '');

                    //If mainScript is still a path, fall back to dataMain
                    if (req.jsExtRegExp.test(mainScript)) {
                        mainScript = dataMain;
                    }

                    //Put the data-main script in the files to load.
                    cfg.deps = cfg.deps ? cfg.deps.concat(mainScript) : [mainScript];

                    return true;
                }
            });
        }

        /**
         * The function that handles definitions of modules. Differs from
         * require() in that a string for the module should be the first argument,
         * and the function to execute after dependencies are loaded should
         * return a value to define the module corresponding to the first argument's
         * name.
         */
        define = function (name, deps, callback) {
            var node, context;

            //Allow for anonymous modules
            if (typeof name !== 'string') {
                //Adjust args appropriately
                callback = deps;
                deps = name;
                name = null;
            }

            //This module may not have dependencies
            if (!isArray(deps)) {
                callback = deps;
                deps = null;
            }

            //If no name, and callback is a function, then figure out if it a
            //CommonJS thing with dependencies.
            if (!deps && isFunction(callback)) {
                deps = [];
                //Remove comments from the callback string,
                //look for require calls, and pull them into the dependencies,
                //but only if there are function args.
                if (callback.length) {
                    callback
                        .toString()
                        .replace(commentRegExp, '')
                        .replace(cjsRequireRegExp, function (match, dep) {
                            deps.push(dep);
                        });

                    //May be a CommonJS thing even without require calls, but still
                    //could use exports, and module. Avoid doing exports and module
                    //work though if it just needs require.
                    //REQUIRES the function to expect the CommonJS variables in the
                    //order listed below.
                    deps = (callback.length === 1 ? ['require'] : ['require', 'exports', 'module']).concat(deps);
                }
            }

            //If in IE 6-8 and hit an anonymous define() call, do the interactive
            //work.
            if (useInteractive) {
                node = currentlyAddingScript || getInteractiveScript();
                if (node) {
                    if (!name) {
                        name = node.getAttribute('data-requiremodule');
                    }
                    context = contexts[node.getAttribute('data-requirecontext')];
                }
            }

            //Always save off evaluating the def call until the script onload handler.
            //This allows multiple modules to be in a file without prematurely
            //tracing dependencies, and allows for anonymous module support,
            //where the module name is not known until the script onload event
            //occurs. If no context, use the global queue, and get it processed
            //in the onscript load callback.
            (context ? context.defQueue : globalDefQueue).push([name, deps, callback]);
        };

        define.amd = {
            jQuery: true
        };

        /**
         * Executes the text. Normally just uses eval, but can be modified
         * to use a better, environment-specific call. Only used for transpiling
         * loader plugins, not for plain JS modules.
         * @param {String} text the text to execute/evaluate.
         */
        req.exec = function (text) {
            /*jslint evil: true */
            return eval(text);
        };

        //Set up with config info.
        req(cfg);
    }(this));
}

